What is 27/64 as a decimal?

27/64 is exactly 0.421875 as a decimal.

How many millimetres is 27/64 of an inch?

27/64 of an inch is 10.715625 mm, computed with the exact definition 1 inch = 25.4 mm.

27/64

Fraction27/64

Decimal0.421875

Percent42.1875%

27 of 64 equal parts filled .

Where the decimal comes from

27/64 equals 421875/1,000,000 equals 0.421875.

Multiply the top and bottom by 15625 and the denominator becomes 1,000,000. A fraction over 1,000,000 is what a decimal is: 0.421875 means 421875 thousandths.

Every way to write it

Decimal: 0.421875
Percent: 42.1875%
Ratio: 27 : 64 (part to whole)
As inches: 27/64″ = 10.715625 mm

Equivalent fractions

Multiply the top and bottom of 27/64 by the same number and the value does not change:

27/64 = 54/128 = 81/192 = 108/256 = 135/320 = 162/384 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 27/64″ is 10.715625 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	7/16″	0.4375	11.1125	+0.3969 mm
32ths	7/16″	0.4375	11.1125	+0.3969 mm
64ths	27/64″	0.421875	10.7156	exact

Need a different rule or a tolerance? Nearest fraction · Within tolerance

Common questions

What is 27/64 as a decimal?: 27/64 is exactly 0.421875 as a decimal.
What is 27/64 as a percentage?: 27/64 is exactly 42.1875%.
How many millimetres is 27/64 of an inch?: 27/64 of an inch is 10.715625 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 27/64 in its place.

Where this comes from. Exact rational arithmetic on the values shown — fractions are pairs of integers until display, and inch–metric conversion uses 25.4 mm to the inch, exact by definition since 1959. See the full methodology.